Dark data is the information your company collects but never uses, often making...

https://victor-wiki.win/index.php/Why_Keeping_Dark_Data_on_Flash_Storage_Is_a_Bad_Idea

Dark data is the information your company collects but never uses, often making up 55% of stored data. This unused data not only wastes money on storage and backup but also raises risks like ransomware attacks and data breaches